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Mack-Cali Realty Corporation Stockholders' Equity (Schedule Of Stock Option Plans) (Details) (USD $)
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9 Months Ended |
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Sep. 30, 2013
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| Mack-Cali Realty Corporation Stockholders' Equity [Abstract] | |
| Shares Under Options - Outstanding, beginning balance | 183,870 |
| Shares Under Options - Lapsed or Cancelled | (168,870) |
| Shares Under Options - Outstanding, ending balance | 15,000 |
| Shares Under Options - Options exercisable | 15,000 |
| Shares Under Options - Available for grant | 4,600,000 |
| Weighted Average Exercise Price - Outstanding, beginning balance | $ 29.51 |
| Weighted Average Exercise Price - Lapsed or Cancelled | $ 28.53 |
| Weighted Average Exercise Price - Outstanding, ending balance | $ 40.54 |
| Outstanding stock option price range, lower range | $ 35.59 |
| Outstanding stock option price range, upper range | $ 45.47 |